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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 */
/*
 * $Id: DOMX509IssuerSerial.java 1667527 2015-03-18 12:54:20Z mullan $
 */
package org.apache.jcp.xml.dsig.internal.dom;

import javax.xml.crypto.MarshalException;
import javax.xml.crypto.dsig.XMLSignature;
import javax.xml.crypto.dsig.keyinfo.X509IssuerSerial;

import java.math.BigInteger;

import javax.security.auth.x500.X500Principal;

import org.w3c.dom.Element;

/**
 * DOM-based implementation of X509IssuerSerial.
 *
 * @author Sean Mullan
 */
public final class DOMX509IssuerSerial extends BaseStructure
    implements X509IssuerSerial {

    private final String issuerName;
    private final BigInteger serialNumber;

    /**
     * Creates a DOMX509IssuerSerial containing the specified
     * issuer distinguished name/serial number pair.
     *
     * @param issuerName the X.509 issuer distinguished name in RFC 2253
     *    String format
     * @param serialNumber the serial number
     * @throws IllegalArgumentException if the format of issuerName
     *    is not RFC 2253 compliant
     * @throws NullPointerException if issuerName or
     *    serialNumber is null
     */
    public DOMX509IssuerSerial(String issuerName, BigInteger serialNumber) {
        if (issuerName == null) {
            throw new NullPointerException("issuerName cannot be null");
        }
        if (serialNumber == null) {
            throw new NullPointerException("serialNumber cannot be null");
        }
        // check that issuer distinguished name conforms to RFC 2253
        new X500Principal(issuerName);
        this.issuerName = issuerName;
        this.serialNumber = serialNumber;
    }

    /**
     * Creates a DOMX509IssuerSerial from an element.
     *
     * @param isElem an X509IssuerSerial element
     */
    public DOMX509IssuerSerial(Element isElem) throws MarshalException {
        Element iNElem = DOMUtils.getFirstChildElement(isElem,
                                                       "X509IssuerName",
                                                       XMLSignature.XMLNS);
        Element sNElem = DOMUtils.getNextSiblingElement(iNElem,
                                                        "X509SerialNumber",
                                                        XMLSignature.XMLNS);
        issuerName = iNElem.getFirstChild().getNodeValue();
        serialNumber = new BigInteger(sNElem.getFirstChild().getNodeValue());
    }

    @Override
    public String getIssuerName() {
        return issuerName;
    }

    @Override
    public BigInteger getSerialNumber() {
        return serialNumber;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof X509IssuerSerial)) {
            return false;
        }
        X509IssuerSerial ois = (X509IssuerSerial)obj;
        return issuerName.equals(ois.getIssuerName()) &&
                serialNumber.equals(ois.getSerialNumber());
    }
 
    @Override
    public int hashCode() {
        int result = 17;
        result = 31 * result + issuerName.hashCode();
        result = 31 * result + serialNumber.hashCode();
        
        return result;
    }
}